Alright, let's work through 78389803 times 85744067 step by step
78389803 × 85744067 = 85744067 × (78389803)
+ 85744067 × 3 that is equal 257232201
+ 85744067 × 00 giving us 0
+ 85744067 × 800 producing 68595253600
+ 85744067 × 9000 which equals 771696603000
+ 85744067 × 80000 that equals 6859525360000
+ 85744067 × 300000 what gives us 25723220100000
+ 85744067 × 8000000 resulting in 685952536000000
+ 85744067 × 70000000 producing 6002084690000000

= 6721460520548801
